Fertile window moved??

Sal • One 💙, one 👼🏻, one 🌈 🎀, by ovulation induction after 2 failed IVF cycles 🤯 | Hypothyroidism & lean pcos 🤨

Husband and I BDed every day in our fertile window and then it MOVED to the following week!!?? I had high fertility 9/28-10/1 and then today LOW fertility on OPK, how can it really be this week??